I discovered that my stats (shown in the beginning of the video) are significantly nerfed ( shown at the end of the video) for no reason.
Since i've seen this bug, i realised that it happens extremely often, sometimes doing nothing in particular.
I am using this build • The Witcher 3 - God Tier Build - Alchemy, ... which makes my toxicity level gives me lots of damage and sign intensity. As you can see on the video, it drops like i had no toxicity level even tho i am still under the effect of my 3 decoction.